From: Bart Van Assche <bvanassche@acm.org>
To: linux-scsi <linux-scsi@vger.kernel.org>,
James Bottomley <jbottomley@parallels.com>,
Mike Christie <michaelc@cs.wisc.edu>,
Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Chanho Min <chanho.min@lge.com>
Subject: [PATCH 0/7 v5] More device removal fixes
Date: Fri, 26 Oct 2012 14:00:35 +0200 [thread overview]
Message-ID: <508A7B63.60608@acm.org> (raw)
Fix a few race conditions that can be triggered by removing a device:
- Avoid that request_fn() can be invoked on a dead queue.
- Avoid that blk_cleanup_queue() can finish while request_fn is still
running.
- Fix a race between starved list processing and device removal.
These patches have been tested on top of kernel v3.7-rc2.
Changes compared to v4:
- Moved queue_flag_set(QUEUE_FLAG_DEAD, q) from blk_drain_queue() into
blk_cleanup_queue().
- Declared the new __blk_run_queue_uncond() function inline. Checked in
the generated assembler code that this function is really inlined in
__blk_run_queue().
- Elaborated several patch descriptions.
- Added sparse annotations to scsi_request_fn().
- Split several patches.
Changes compared to v3:
- Fixed a race condition by setting QUEUE_FLAG_DEAD earlier.
- Added a patch for fixing a race between starved list processing
and device removal to this series.
Changes compared to v2:
- Split second patch into two patches.
- Refined patch descriptions.
Changes compared to v1:
- Included a patch to rename QUEUE_FLAG_DEAD.
- Refined the descriptions of the __blk_run_queue_uncond() and
blk_cleanup_queue() functions.
next reply other threads:[~2012-10-26 12:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 12:00 Bart Van Assche [this message]
2012-10-26 12:01 ` [PATCH 1/7] block: Avoid that blk_drain_queue() finishes early Bart Van Assche
2012-10-29 1:47 ` Tejun Heo
2012-10-29 1:52 ` Tejun Heo
2012-10-29 14:35 ` Bart Van Assche
2012-10-26 12:02 ` [PATCH 2/7] block: Let blk_drain_queue() caller obtain the queue lock Bart Van Assche
2012-10-29 1:55 ` Tejun Heo
2012-10-26 12:02 ` [PATCH 3/7] block: Rename queue dead flag Bart Van Assche
2012-10-26 12:03 ` [PATCH 4/7] block: Avoid that request_fn is invoked on a dead queue Bart Van Assche
2012-10-29 1:59 ` Tejun Heo
2012-10-26 12:04 ` [PATCH 5/7] block: Make blk_cleanup_queue() wait until request_fn finished Bart Van Assche
2012-10-29 2:00 ` Tejun Heo
2012-10-26 12:05 ` [PATCH 6/7] Fix race between starved list processing and device removal Bart Van Assche
2012-10-28 18:01 ` Zhuang, Jin Can
2012-10-29 14:32 ` Bart Van Assche
2012-10-30 5:40 ` Zhuang, Jin Can
2012-11-02 10:48 ` Bart Van Assche
2012-11-21 11:06 ` Bart Van Assche
[not found] ` <026701cdb8c3$d2e3cb50$78ab61f0$@min@lge.com>
2012-11-21 12:10 ` Bart Van Assche
2012-10-29 2:07 ` Tejun Heo
2012-10-26 12:05 ` [PATCH 7/7] Remove get_device() / put_device() pair from scsi_request_fn() Bart Van Assche
2012-10-29 2:08 ` Tejun Heo
2012-11-23 10:37 ` [PATCH 0/7 v5] More device removal fixes Bart Van Assche
2012-11-26 17:19 ` Bart Van Assche
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